Improved compound tor insulating



" ALFRED H. CASTLE, OF ANN ARBOR, MICHIGAN.

Letters Patent N 0. 97,045, dated November 2 3, 1869.

IMPR,QVED COMPOUND FOR INSULATING.

The Schedule referred to in these Letters Patent and making part of the same.

To all whom it may concern.- verulent argillaceous and caustic compound stirred in Be it known that I, ALFRED H. CASTLE, of Ann until it asshme$ the desired cohslstehcifl v Arbor, in the county of Washtenaw, and "State of A chemlcitl hhloh 13 formed between e thktthne Michigan, have invented certain new and useful IID- base and the hlthhleh, which is capable of resisting not only the action of water, but alsoaff'ords a comprovenneuts in an Insulating-Compound; and I do hereby declare that the following is a full and com- Pound that f P qolhmohly'cithed mplete de ri ti n f th same, tor of electricity, and which can be used with advanr 'Il1e 'nat-ureof my invention relates .to the comt g that ph p 1 the n y of the h being pounding oi certain ingredients, whereby a composi- Increased, t0 gwe the compound the desired y, 'tion is obtained, which is strongly adhesive, and a nonwhen used i 1th lhshlathrconductor of electric galvanic currents, to be used in the Claim.

construction of insulators for telegraphic purposes, 850. W 1 1m as my invention d d i t secure In this compound, I use, by preference, liquid biy Letters Patent tumen, finely-pulverized shale, or other argillaceous A .i l i d, composed bit earths hhd caustic (lhlckhme, two latter gillaceous earths, and quick-lime, when the ingredients ghethehts about eqlhh p p fl in it y named are compounded and used for the purpose herestate, and intimately incorporated with each other. i d ib d,

The bituminous matter consists of a hydrocarbon, ALFRED H, CASTLE. which, as is well known to chemists, contains about fit ten per cent. of oxygen, and, consequently, has an W, H, BURRIDGE,

acid reaction, This is gently warmed, and the pul- J H 

